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Assessment of voltage unbalance
IEEE Transactions on Power Delivery, 2001This paper endeavors to present a comprehensive summary of the causes and effects of voltage unbalance and to discuss related standards, definitions, and mitigation techniques. Several causes of voltage unbalance on the power system and in industrial facilities are presented as well as the resulting adverse effects on the system and on equipment such ...
A Von Jouanne
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Unbalance compensation control in microgrids based on the unbalance profile
Electric Power Systems Research, 2021Abstract Voltage unbalances are a common issue in microgrids (MGs), especially under islanded operation. In these conditions, distributed generators (DGs) can be used as compensating devices. Currently, the compensation techniques based on DGs focus on a specific point of the grid, usually the Point of Common Coupling (PCC) or a Sensitive Load Bus ...
Vinicius P. Suppioni, Ahda Grilo-Pavani
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Graphs and Combinatorics, 2008
The authors present the following nice result: If the unbalance of an intersecting family of sets \( \mathcal{F} \) is defined as \( u(\mathcal{F}) = |\mathcal{F}|-d(\mathcal{F}) \) where \( d(\mathcal(F)=\max|\{F\in\mathcal{F}:x\in F\}| \), where the maximum is taken over all vertices x, then for k-uniform intersecting families \( u(\mathcal{F}) \leqq
Nathan Lemons, Cory Palmer
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The authors present the following nice result: If the unbalance of an intersecting family of sets \( \mathcal{F} \) is defined as \( u(\mathcal{F}) = |\mathcal{F}|-d(\mathcal{F}) \) where \( d(\mathcal(F)=\max|\{F\in\mathcal{F}:x\in F\}| \), where the maximum is taken over all vertices x, then for k-uniform intersecting families \( u(\mathcal{F}) \leqq
Nathan Lemons, Cory Palmer
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Journal of Applied Physiology, 2006
The truth is balance . However the opposite of truth, which is unbalance, may not be a lie. Susan Sontag, US author and critic (1933–xxxx). If balance is truth, homeostasis is its biological expression.
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The truth is balance . However the opposite of truth, which is unbalance, may not be a lie. Susan Sontag, US author and critic (1933–xxxx). If balance is truth, homeostasis is its biological expression.
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Definitions of Voltage Unbalance
IEEE Power Engineering Review, 2001Author Affiliations: Clarkson University, Potsdam, NY; Department of Electrical Engineering, University of Cape Town, South Africa. Abstract: This letter reviews three definitions of voltage unbalance developed by NEMA, IEEE, and the power community, respectively.
P. Pillay, M. Manyage
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Review of Scientific Instruments, 1948
The transmission of unbalanced currents on shielded pair lines can be stopped by a double stub device called an unbalance squelcher. The unbalance squelcher, which is substantially a tandem bridge for unbalanced currents, reflects completely the unbalanced currents yet allows free passage of the balanced currents.
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The transmission of unbalanced currents on shielded pair lines can be stopped by a double stub device called an unbalance squelcher. The unbalance squelcher, which is substantially a tandem bridge for unbalanced currents, reflects completely the unbalanced currents yet allows free passage of the balanced currents.
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2017
Most of the cases of rotor vibration problems come from excessive vibration or resonance due to unbalance. A quick remedy to compensate for it is balancing. Balancing is based on the assumptions of a linear relationship between input (unbalance) and output (vibration), namely, The amplitude of unbalance vibration is proportional to the level of ...
Osami Matsushita +4 more
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Most of the cases of rotor vibration problems come from excessive vibration or resonance due to unbalance. A quick remedy to compensate for it is balancing. Balancing is based on the assumptions of a linear relationship between input (unbalance) and output (vibration), namely, The amplitude of unbalance vibration is proportional to the level of ...
Osami Matsushita +4 more
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Compensation for unbalances at magnetic bearings
1997The aim of this paper is to provide a new method to compensate remaining unbalances at magnetic bearings. The compensating signal will be generated by a MLP-network. The main advantage that this new method presents lies in the simplified manner of operation rather than in a qualitative improvement of disturbance compensation.
Mathias Paul, Wilfried Hofmann
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Experimental Analysis of Double Unbalances
Transactions of the American Institute of Electrical Engineers, 1935Double unbalances in 3-phase electric power networks may be analyzed experimentally on the network ``calculating board'' by applying the method of symmetrical components 2 such methods of analysis are presented in this paper. Although intended primarily for use with the a-c calculating board, some of the material is applicable to the d-c board and to ...
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The Estimation of Rotor Unbalance
Volume 1B: 16th Biennial Conference on Mechanical Vibration and Noise, 1997Abstract A method is presented to determine the state of unbalance of a rotating machine. The only requirement of the procedure is a good numerical model for the rotor and an approximate model for the bearing behaviour. No assumptions are made concerning the operational mode shape of the rotor and the influence of the supporting ...
A. W. Lees, M. I. Friswell
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